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Find the first non repeating character in a string using C/C++?

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40/(1/2)+15 =40*2+15 =80+15 =95

40 / (1/2) = 80

Add 15 => 80+15 = 95

40/(1/2)+15 =40*2+15 =95

If 9 boy working 15/2 hours a day can finish a work in 20 days, then how many days will be taken by 12 boy working 6 hours a day to finish the work, it being given than 3 boy of latter type work as much as 2 boy of he former type in the same.

Find the value of x and y if

[40/(x+y)] + [2/(x-y)] = 5 [25/(x+y)] - [3/(x-y)] = 1

? + ? + ? + ? + ? = 30

You have to fill numbers in place of question marks. The numbers that you can use are 1, 3, 5, 7, 9, 11, 13 and 15. You can repeat the numbers if you like.